Question 2

A patient who was admitted to the intensive care unit for a major gastrointestinal bleed receives a red cell transfusion. One hour after the transfusion, he complains of severe dyspnea. Over the next 30 minutes he develops respiratory failure and fevers with a chest x-ray showing infiltrates. He is intubated, but over the next 24 hours he improves and is extubated in 48 hours. What reaction is this scenario consistent with?